The London Journal of Arts and Sciences, المجلد 11Sherwood, Neely, and Jones, 1826 Containing reports of all new patents, with a description of their respective principles and properties: also, original communications on subjects connected with science and philosophy; particularly such as embrace the most recent inventions and dicoveries in practical mechanics. |
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1st Sat acid actuated aperture apparatus applied attached axle beam bevelled bobbin boiler bolt bottom bricks carriage City of London cloth cock colour conj construction contrivance County of Middlesex cranks cylinder described Ditto-ditto double stars drawing rollers dry rot Ecliptic effect employed fabric frame friction front frustrums gig barrels groove heat holes improvements inches inclined plane Inrolled invention iron lever liquor London loom lower machine machinery manufacture mast material means Medal metal Middlesex mode months mould observations OD in conj operation ordinary paddles Paris pass patentee piece pinion pipe piston placed plate pressure prevent printing roller produce propelling proposed pulley pump purpose pusher rail revolve rotatory Rotherhithe round screw Sealed shaft shewn side sliding stars steam engine surface tappets tion toothed wheel troy pound tube turn upper valve vessel weft wool
مقاطع مشهورة
الصفحة 299 - London, merchant, in consequence of a communication made to him by a certain foreigner residing abroad, for an invention of " certain improvements in boilers for generating steam.
الصفحة 308 - I make the compound, or compounds, with which I unite or combine the said substances, as follows. (No. 1.) I take two pounds of caoutchouc, dissolved in one gallon of equal parts of oil of turpentine and highly rectified coal-tar oil, six ounces of black resin, two pounds of strong glue size, and one pound of ochre, powdered pumice, or whiting, and mix the whole together ; or (No.
الصفحة 326 - I have now accomplished one-third of the labour, and have found 1000 double stars of the first four classes, among which 800 are new, and of these nearly 300 are of the first class.
الصفحة 158 - ... importance in the theory and practice of navigation. Fortunately science, like that nature to which it belongs, is neither limited by time nor by space. It belongs to the world, and is of no country and no age. The more we know, the more we feel our ignorance, the more we feel how much remains unknown ; and in philosophy, the sentiment of the Macedonian hero can never apply, — there are always new worlds to conquer.
الصفحة 261 - In some of these experiments, a pressure of 1600 pounds to the square inch has been used with perfect safety, and was found to project musket balls of the same weight and distance one quarter farther into the target than the strongest gunpowder. Mr Perkins has made another very curious discovery in experimenting on high steam, namely, that temperature does not always show the true power of the steam, although the steam is in contact with the water from which it is generated ; but we cannot be so...
الصفحة 311 - HITHERTO alcohol, or more properly brandy, could not be rectified, or raised from an inferior to a higher degree, and consequently be brought to a superior state of purity and strength, except by distillation, an operation which could only be effected by an alembic and some heat. The mode of rectification here treated of can be performed in the cold, and consequently without the aid of an alembic or of combustibles. The following in general is the method of proceeding : On the one part there is poured...
الصفحة 254 - It was a shrewd observation of Anacharsis the Scythian, who had never seen money in his own country, that gold and silver seemed to him of no use to the Greeks, but to assist them in numeration and arithmetic. It is indeed evident that money is nothing but the representation of labour and commodities, and serves only as a method of rating or estimating them.
الصفحة 167 - Letters from the East. Written during a recent Tour through Turkey, Egypt, Arabia, Palestine, Syria and Greece. By John Carne, Esq. of Queen's College", Cambridge. In One large Volume 8vo.
الصفحة 230 - In commencing the operation, the cock q is to be turned, so as to open the communication i, between the metal chest i, and the exhausted air vessel p, by which the pressure of the atmosphere is removed from the surface of the metal, for the purpose of preventing it from rushing up the pipe / into the exhausted mould, when the mouth of the pipe opens by the melting of the metal cap, which cap is to be made of...
الصفحة 37 - Sc. Tech. Mars 1825. p. 180,) informs us, that the evil arising from inequality of thickness may be cured by making a cut with a diamond in the bottom of the tube, and he remarks that, in establishments where six lamps are lighted every day, and where this precaution was taken, there was not a single glass broken for nine years.